Always bugs me when people stretch their images out of proportion, there’s really no reason for it. Just use this simply function to nicely resize your images! If you want all your images the same size (like a square), I recommend “trim”. Otherwise use “squeeze”. If you can think of more appropriate fill names, let me know!
<?php
// @fill
// center - Centers the image without any scaling. May be smaller than dimensions, or cropped.
// stretch - Stretches the image to fill dimensions. May change image proportions.
// squeeze - Scales the image, maintaining original proportions. May not fill dimensions.
// trim - Scales the image, maintaining original proportions, to fill dimensions. Image may be centered and trimmed.
// trim_rand - Scales the image, maintaining original proportions, to fill dimensions. Trimmed randomly.
function resize($src_filename, $dst_filename, $dst_width, $dst_height, $fill='squeeze', $quality=80, $png_filters=PNG_NO_FILTER)
{
if(!file_exists($src_filename)) {
//throw new Exception("File does not exist: $src_filename");
return false;
}
if(empty($dst_filename)) {
$dst_filename = $src_filename;
}
if($dst_width <= 0) {
//throw new Exception("Width must be positive: $dst_width");
return false;
}
if($dst_height <= 0) {
//throw new Exception("Height must be positive: $dst_height");
return false;
}
$src_ext = substr($src_filename,strrpos($src_filename,'.')+1);
switch(strtolower($src_ext)) {
case 'gif':
$src_image = imagecreatefromgif($src_filename);
break;
case 'jpe':
case 'jpeg':
case 'jpg':
$src_image = imagecreatefromjpeg($src_filename);
break;
case 'png':
$src_image = imagecreatefrompng($src_filename);
break;
default:
//throw new Exception("Invalid source file extension: $src_ext");
return false;
}
$src_width = imagesx($src_image);
$src_height = imagesy($src_image);
switch(strtolower(trim($fill))) {
case 'center':
$src_x = round($src_width/2-$dst_width/2);
$src_y = round($src_height/2-$dst_height/2);
if($src_x < 0) {
$dst_width = $src_width;
$src_x = 0;
}
if($src_y < 0) {
$dst_height = $src_height;
$src_y = 0;
}
$dst_image = imagecreatetruecolor($dst_width, $dst_height);
imagecopyresampled($dst_image, $src_image, 0, 0, $src_x, $src_y, $dst_width, $dst_height, $dst_width, $dst_height);
break;
case 'stretch':
$dst_image = imagecreatetruecolor($dst_width, $dst_height);
imagecopyresampled($dst_image, $src_image, 0, 0, 0, 0, $dst_width, $dst_height, $src_width, $src_height);
break;
case 'crop':
case 'crop_center':
case 'trim_center':
case 'trim':
$src_ratio = $src_width/$src_height;
$dst_ratio = $dst_width/$dst_height;
if($src_ratio < $dst_ratio) // trim top and bottom
{
$ratio = $src_width/$dst_width;
$crop_height = $dst_height*$ratio;
$src_y = round(($src_height-$crop_height)/2);
$crop_width = $src_width;
$src_x = 0;
}
else // trim left and right
{
$ratio = $src_height/$dst_height;
$crop_width = $dst_width*$ratio;
$src_x = round(($src_width-$crop_width)/2);
$crop_height = $src_height;
$src_y = 0;
}
$dst_image = imagecreatetruecolor($dst_width, $dst_height);
imagecopyresampled($dst_image, $src_image, 0, 0, $src_x, $src_y, $dst_width, $dst_height, $crop_width, $crop_height);
break;
case 'crop_rand':
case 'trim_rand':
$src_ratio = $src_width/$src_height;
$dst_ratio = $dst_width/$dst_height;
if($src_ratio < $dst_ratio) // trim top and bottom
{
$ratio = $src_width/$dst_width;
$crop_height = $dst_height*$ratio;
$src_y = rand(0,$src_height-$crop_height);
$crop_width = $src_width;
$src_x = 0;
}
else // trim left and right
{
$ratio = $src_height/$dst_height;
$crop_width = $dst_width*$ratio;
$src_x = rand(0,$src_width-$crop_width);
$crop_height = $src_height;
$src_y = 0;
}
$dst_image = imagecreatetruecolor($dst_width, $dst_height);
imagecopyresampled($dst_image, $src_image, 0, 0, $src_x, $src_y, $dst_width, $dst_height, $crop_width, $crop_height);
break;
case 'squeeze':
case 'stretch_prop':
case 'fit':
$ratio = max($src_width/$dst_width, $src_height/$dst_height);
if($ratio < 1) $ratio = 1; // do not enlarge
$dst_width = round($src_width/$ratio);
$dst_height = round($src_height/$ratio);
$dst_image = imagecreatetruecolor($dst_width, $dst_height);
imagecopyresampled($dst_image, $src_image, 0, 0, 0, 0, $dst_width, $dst_height, $src_width, $src_height);
break;
default:
//throw new Exception("Unrecognized fill type: $fill");
return false;
}
$dst_ext = substr($dst_filename,strrpos($dst_filename,'.')+1);
if(empty($dst_ext)) {
$dst_ext = $src_ext;
$dst_filename .= ".$src_ext";
}
switch(strtolower($dst_ext)) {
case 'gif':
return imagegif($dst_image, $dst_filename);
case 'jpe':
case 'jpeg':
case 'jpg':
return imagejpeg($dst_image, $dst_filename, $quality);
case 'png':
return imagepng($dst_image, $dst_filename, $quality, $png_filters);
default:
//throw new Exception('Invalid destination file extension: $dst_ext');
return false;
}
}
?>
// @fill
// center - Centers the image without any scaling. May be smaller than dimensions, or cropped.
// stretch - Stretches the image to fill dimensions. May change image proportions.
// squeeze - Scales the image, maintaining original proportions. May not fill dimensions.
// trim - Scales the image, maintaining original proportions, to fill dimensions. Image may be centered and trimmed.
// trim_rand - Scales the image, maintaining original proportions, to fill dimensions. Trimmed randomly.
function resize($src_filename, $dst_filename, $dst_width, $dst_height, $fill='squeeze', $quality=80, $png_filters=PNG_NO_FILTER)
{
if(!file_exists($src_filename)) {
//throw new Exception("File does not exist: $src_filename");
return false;
}
if(empty($dst_filename)) {
$dst_filename = $src_filename;
}
if($dst_width <= 0) {
//throw new Exception("Width must be positive: $dst_width");
return false;
}
if($dst_height <= 0) {
//throw new Exception("Height must be positive: $dst_height");
return false;
}
$src_ext = substr($src_filename,strrpos($src_filename,'.')+1);
switch(strtolower($src_ext)) {
case 'gif':
$src_image = imagecreatefromgif($src_filename);
break;
case 'jpe':
case 'jpeg':
case 'jpg':
$src_image = imagecreatefromjpeg($src_filename);
break;
case 'png':
$src_image = imagecreatefrompng($src_filename);
break;
default:
//throw new Exception("Invalid source file extension: $src_ext");
return false;
}
$src_width = imagesx($src_image);
$src_height = imagesy($src_image);
switch(strtolower(trim($fill))) {
case 'center':
$src_x = round($src_width/2-$dst_width/2);
$src_y = round($src_height/2-$dst_height/2);
if($src_x < 0) {
$dst_width = $src_width;
$src_x = 0;
}
if($src_y < 0) {
$dst_height = $src_height;
$src_y = 0;
}
$dst_image = imagecreatetruecolor($dst_width, $dst_height);
imagecopyresampled($dst_image, $src_image, 0, 0, $src_x, $src_y, $dst_width, $dst_height, $dst_width, $dst_height);
break;
case 'stretch':
$dst_image = imagecreatetruecolor($dst_width, $dst_height);
imagecopyresampled($dst_image, $src_image, 0, 0, 0, 0, $dst_width, $dst_height, $src_width, $src_height);
break;
case 'crop':
case 'crop_center':
case 'trim_center':
case 'trim':
$src_ratio = $src_width/$src_height;
$dst_ratio = $dst_width/$dst_height;
if($src_ratio < $dst_ratio) // trim top and bottom
{
$ratio = $src_width/$dst_width;
$crop_height = $dst_height*$ratio;
$src_y = round(($src_height-$crop_height)/2);
$crop_width = $src_width;
$src_x = 0;
}
else // trim left and right
{
$ratio = $src_height/$dst_height;
$crop_width = $dst_width*$ratio;
$src_x = round(($src_width-$crop_width)/2);
$crop_height = $src_height;
$src_y = 0;
}
$dst_image = imagecreatetruecolor($dst_width, $dst_height);
imagecopyresampled($dst_image, $src_image, 0, 0, $src_x, $src_y, $dst_width, $dst_height, $crop_width, $crop_height);
break;
case 'crop_rand':
case 'trim_rand':
$src_ratio = $src_width/$src_height;
$dst_ratio = $dst_width/$dst_height;
if($src_ratio < $dst_ratio) // trim top and bottom
{
$ratio = $src_width/$dst_width;
$crop_height = $dst_height*$ratio;
$src_y = rand(0,$src_height-$crop_height);
$crop_width = $src_width;
$src_x = 0;
}
else // trim left and right
{
$ratio = $src_height/$dst_height;
$crop_width = $dst_width*$ratio;
$src_x = rand(0,$src_width-$crop_width);
$crop_height = $src_height;
$src_y = 0;
}
$dst_image = imagecreatetruecolor($dst_width, $dst_height);
imagecopyresampled($dst_image, $src_image, 0, 0, $src_x, $src_y, $dst_width, $dst_height, $crop_width, $crop_height);
break;
case 'squeeze':
case 'stretch_prop':
case 'fit':
$ratio = max($src_width/$dst_width, $src_height/$dst_height);
if($ratio < 1) $ratio = 1; // do not enlarge
$dst_width = round($src_width/$ratio);
$dst_height = round($src_height/$ratio);
$dst_image = imagecreatetruecolor($dst_width, $dst_height);
imagecopyresampled($dst_image, $src_image, 0, 0, 0, 0, $dst_width, $dst_height, $src_width, $src_height);
break;
default:
//throw new Exception("Unrecognized fill type: $fill");
return false;
}
$dst_ext = substr($dst_filename,strrpos($dst_filename,'.')+1);
if(empty($dst_ext)) {
$dst_ext = $src_ext;
$dst_filename .= ".$src_ext";
}
switch(strtolower($dst_ext)) {
case 'gif':
return imagegif($dst_image, $dst_filename);
case 'jpe':
case 'jpeg':
case 'jpg':
return imagejpeg($dst_image, $dst_filename, $quality);
case 'png':
return imagepng($dst_image, $dst_filename, $quality, $png_filters);
default:
//throw new Exception('Invalid destination file extension: $dst_ext');
return false;
}
}
?>